Dhruin
SasqWatch
Thrasher points out an official (Prima Guides) Skyrim map app for iOS - the basic app is free but you need to pay extra to get much that's useful (US only, apparently).
More information.
More information.
•Official world map of Skyrim and all 9 hold capital cities for (free)
•Over 160 interior maps, 350 primary locations, 200 secondary locations and over 1,000 points of interest can be unlocked through in-app purchases
•Toggle points of interest on or off and zoom in on the map as far as 3200%
•Add your own custom points of interest by dropping a pin anywhere on the map
•Fully integrated search function
•Screenshots of all 9 hold capital cities as well as primary and secondary locations
•Easily keep track of what you’ve discovered along the way
over 1,000 points of interest can be unlocked through in-app purchases